package Second.custom;

import android.content.Context;
import android.content.res.TypedArray;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import com.example.myapplication.R;

public class AmountView extends LinearLayout implements View.OnClickListener, TextWatcher {

private static final String TAG = "AmountView";
private int amount = 1; //购买数量
private int goods_storage = 1; //商品库存

private OnAmountChangeListener mListener;

private EditText etAmount;
private Button btnDecrease;
private Button btnIncrease;

public AmountView(Context context) {
        this(context, null);
        }

public AmountView(Context context, AttributeSet attrs) {
        super(context, attrs);

        LayoutInflater.from(context).inflate(R.layout.view_amount, this);
        etAmount = (EditText) findViewById(R.id.etAmount);
        btnDecrease = (Button) findViewById(R.id.btnDecrease);
        btnIncrease = (Button) findViewById(R.id.btnIncrease);
        btnDecrease.setOnClickListener(this);
        btnIncrease.setOnClickListener(this);
        etAmount.addTextChangedListener(this);

        TypedArray obtainStyledAttributes = getContext().obtainStyledAttributes(attrs, R.styleable.AmountView);
        int btnWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnWidth, LayoutParams.WRAP_CONTENT);
        int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 80);
        int tvTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvTextSize, 0);
        int btnTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnTextSize, 0);
        obtainStyledAttributes.recycle();

        LayoutParams btnParams = new LayoutParams(btnWidth, LayoutParams.MATCH_PARENT);
        btnDecrease.setLayoutParams(btnParams);
        btnIncrease.setLayoutParams(btnParams);
        if (btnTextSize != 0) {
        btnDecrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
        btnIncrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
        }

        LayoutParams textParams = new LayoutParams(tvWidth, LayoutParams.MATCH_PARENT);
        etAmount.setLayoutParams(textParams);
        if (tvTextSize != 0) {
        etAmount.setTextSize(tvTextSize);
        }
        }

public void setOnAmountChangeListener(OnAmountChangeListener onAmountChangeListener) {
        this.mListener = onAmountChangeListener;
        }

public void setGoods_storage(int goods_storage) {
        this.goods_storage = goods_storage;
        }

@Override
public void onClick(View v) {
        int i = v.getId();
        if (i == R.id.btnDecrease) {
        if (amount > 1) {
        amount--;
        etAmount.setText(amount + "");
        }
        } else if (i == R.id.btnIncrease) {
        if (amount < goods_storage) {
        amount++;
        etAmount.setText(amount + "");
        }
        }

        etAmount.clearFocus();

        if (mListener != null) {
        mListener.onAmountChange(this, amount);
        }
        }

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

@Override
public void afterTextChanged(Editable s) {
        if (s.toString().isEmpty())
        return;
        amount = Integer.valueOf(s.toString());
        if (amount > goods_storage) {
        etAmount.setText(goods_storage + "");
        return;
        }

        if (mListener != null) {
        mListener.onAmountChange(this, amount);
        }
        }


public interface OnAmountChangeListener {
    void onAmountChange(View view, int amount);
}

}